dot on maps

Is there a way to combine/tie graphviz output and an
underlying map 
together?  

I have a map in svg format and I would like to define
graphviz nodes to 
exist at pre-defined fixed coordinates on this map.  I'd
like to use 
graphviz to render the nodes at the fixed coordinates. 
graphviz would 
also draw edges between the nodes.  Everything would be in
svg output 
format so browsing/zooming would work but the nodes would
scale and yet 
remain at the predefined fixed locations on the map.

Is this possible?   Examples of how to do this?

Thanks



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